Inhibitors of leukotriene a4 hydrolase

ABSTRACT

The present invention is directed to compounds encompassed by the Formula (I), pharmaceutical compositions thereof, methods for inhibiting LTA-4 hydrolase, and methods for the treatment of a disease and disorder which is ameliorated by the inhibition of LTA4-h activity. Non-limiting examples of such diseases and conditions include inflammatory and autoimmune diseases and disorders.

RELATED APPLICATIONS

This application is a divisional of U.S. application Ser. No. 14/849,829, filed Sep. 10, 2015, which is a continuation of International Application No. PCT/US2014/027449, which designated the United States and was filed on Mar. 14, 2014, published in English, which claims the benefit of U.S. Provisional Application No. 61/781,168, filed on Mar. 14, 2013. The entire teachings of the above applications are incorporated herein by reference.

BACKGROUND OF THE INVENTION

Leukotriene B₄ (LTB₄) is a potent pro-inflammatory activator of inflammatory cells, including neutrophils (J. Palmblad, J. Rheumatol. 1984, 13(2):163-172), eosinophils (A. M. Tager, et al., J. Exp. Med. 2000, 192(3):439-446), monocytes (N. Dugas et al., Immunol. 1996, 88(3):384-388), macrophages (L. Gagnon et al., Agents Actions 1989, 34(1-2):172-174), T cells (H. Morita et al., Biochem. Biophys. Res. Commun. 1999, 264(2):321-326) and B cells (B. Dugas et al., J. Immunol. 1990, 145(10):3405-3411). Immune cell priming and activation by LTB₄ can promote chemotaxis, adhesion, free radical release, degranulation and cytokine release. LTB₄ stimulates T-cell proliferation and cytokine release in response to IL-2, concanavalin-A and CD3 ligation (H. Morita et al., Biochem. Biophys. Res. Commun. 1999, 264(2):321-326). LTB₄ is a chemoattractant for T-cells creating a functional link between early innate and late adaptive immune responses to inflammation (K. Goodarzi, et al., Nat. Immunol. 2003, 4:965-973; V. L. Ott, et al., Nat. Immunol. 2003, 4:974-981; A. M. Tager, et al., Nat. Immunol. 2003, 4:982-990). There is substantial evidence that LTB₄ plays a significant role in the amplification of many inflammatory disease states (R. A. Lewis et al., N. Engl. J. Med. 1990, 323:645; W. R. Henderson, Ann. Intern. Med. 1994, 121:684) including asthma (D. A. Munafo et al., J. Clin. Invest. 1994, 93(3):1042-1050), inflammatory bowel disease (IBD) (P. Sharon and W. F. Stenson, Gastroenterology 1984, 86(3):453-460), chronic obstructive pulmonary disease (COPD) (P. J. Barnes, Respiration 2001, 68(5):441-448), arthritis (R. J. Griffiths et al., Proc. Natl. Acad. Sci. U.S.A. 1995, 92(2):517-521; F. Tsuji et al., Life Sci. 1998 64(3):L51-L56), psoriasis (K. Ikai, J. Dermatol. Sci. 1999, 21(3):135-146; Y. I. Zhu and M. J. Stiller, Skin Pharmacol. Appl. Skin Physiol. 2000, 13(5):235-245), and atherosclerosis (E. B. Friedrich, et al., Arterioscler. Thromb. Vasc. Biol. 2003, 23:1761-1767; K. Subbarao, et al., Arterioscler. Thromb. Vasc. Biol. 2004, 24:369-375; A. Helgadottir, et al., Nat. Genet. 2004, 36:233-239; V. R. Jala, et al., Trends in Immun. 2004, 25:315-322). LTB₄ also simulates the production of various cytokines and may play a role in immunoregulation (A. W. Ford-Hutchinson, Immunology 1990, 10:1). Furthermore, it has been shown that LTB₄ levels are elevated in brochoalveolar lavage fluid from patients with scleroderma lung disease (see Kowal-Bielecka, O. et al., Arthritis Rheum. (Nov. 30, 2005), Vol. 52, No. 12, pp. 3783-3791). Therefore, a therapeutic agent that inhibits the biosynthesis of LTB4 or the response of cells to LTB₄ may be useful for the treatment of these inflammatory conditions.

The biosynthesis of LTB₄ from arachidonic acid (AA) involves the action of three enzymes: phospholipase A₂ (PLA₂), to release AA from the membrane lipids; 5-lipoxygenase (5-LO), to form the unstable epoxide Leukotriene A₄ (LTA₄); and leukotriene A₄ hydrolase (LTA₄-h), to form LTB₄ (A. W. Ford-Hutchinson, et al., Annu. Rev. Biochem. 1994, 63:383-347). The cysteinyl leukotrienes are formed by the addition of glutathione to LTA₄ by the action of LTC₄ synthase (Aharony, D., Am. J. Respir. Crit. Care Med. 1998, 157 (6, Pt 2), S214-S218) into the pro-inflammatory cysteinyl leukotrienes LTC₄, LTD₄ and LTE₄. An alternative path for LTA₄ is conversion via transcellular biosynthesis and the action of lipoxygenases into lipoxin A₄ (LXA₄) and lipoxin B₄ (LXB₄) (C. N. Serhan, Prostaglandins 1997, 53:107-137).

LTA₄-h is a monomeric, soluble 69 kD zinc metalloenzyme. A high resolution crystal structure of recombinant LTA₄-h with bound inhibitors has been obtained (M. M. Thunissen et al., Nat Struct. Biol. 2001, 8(2): 131-135). LTA₄-h is a bifunctional zinc-dependent metalloenzyme of the M1 class of metallohydrolases. It catalyses two reactions: the stereospecific epoxide hydrolase reaction to convert LTA₄ to LTB₄ and a peptidase cleavage of chromogenic substrates. The Zn center is critical to both activities. LTA₄-h is related to aminopeptidases M and B, which have no LTA₄-hydrolase activity. LTA₄-h has high substrate specificity, accepting only a 5,6-trans-epoxide with a free carboxylic acid at C-1 of the fatty acid. The double-bond geometry of the substrate is essential for catalysis. In contrast, LTA₄-h peptidase activity appears to be promiscuous, cleaving nitroanilide and 2-naphthylamide derivatives of various amino acids, e.g. in particular alanine and arginine. Arg-Gly-Asp, Arg-Gly-Gly, and Arg-His-Phe tripeptides are hydrolyzed with specificity constants (k_(cat)/K_(m)) similar to the epoxide hydrolase reaction. There is no known physiological peptide substrate for LTA₄-h.

LTA₄-h is widely expressed as a soluble intracellular enzyme in intestine, spleen, lung and kidney. High activity levels are found in neutrophils, monocytes, lymphocytes and erythrocytes. Tissue macrophages can have high LTA₄-h levels. An interesting feature is that the cellular distribution of LTA₄-h and 5-LO are distinct, requiring close apposition of cells such as neutrophils and epithelial cells for efficient transcellular LTB₄ synthesis. Many studies support this concept, including data from bone marrow chimeras derived from LTA₄-h^(−/−) and 5-LO^(−/−) mice (J. E. Fabre et al., J. Clin. Invest. 2002, 109(10):1373-1380).

Studies have shown that introduction of exogenous LTB₄ into normal tissues can induce inflammatory symptoms (R. D. R. Camp et al., Br. J. Pharmacol. 1983, 80(3):497-502; R. Camp et al., J. Invest. Dermatol. 1984, 82(2):202-204). Elevated levels of LTB₄ have been observed in a number of inflammatory diseases including inflammatory bowel disease (IBD), chronic obstructed pulmonary disease (COPD), psoriasis, rheumatoid arthritis (RA), cystic fibrosis, multiple sclerosis (MS), and asthma (S. W. Crooks and R. S. Stockley, Int. J. Biochem. Cell Biol. 1998, 30(2):173-178). Therefore, reduction of LTB₄ production by an inhibitor of LTA₄-h activity would be predicted to have therapeutic potential in a wide range of diseases. This idea is supported by a study of LTA₄-h-deficient mice that, while otherwise healthy, exhibited markedly decreased neutrophil influx in arachidonic acid-induced ear inflammation and zymosan-induced peritonitis models (R. S. Byrum et al., J. Immunol. 1999, 163(12):6810-68129). LTA₄-h inhibitors have been shown to be effective anti-inflammatory agents in preclinical studies. For example, oral administration of LTA₄-h inhibitor SC57461 caused inhibition of ionophore-induced LTB4 production in mouse blood ex vivo, and in rat peritoneum in vivo (J. K. Kachur et al., J. Pharm. Exp. Thr. 2002, 300(2): 583-587). Eight weeks of treatment with the same inhibitor significantly improved colitis symptoms in cotton top tamarins (T. D. Penning, Curr. Pharm. Des. 2001, 7(3):163-179). The spontaneous colitis that develops in these animals is very similar to human IBD. The results therefore indicate that LTA₄-h inhibitors would have therapeutic utility in this and other human inflammatory diseases.

Events that elicit the inflammatory response include the formation of the pro-inflammatory mediator LTB_(4,) which can be blocked with an LTA₄-h inhibitor, thus providing the ability to prevent and/or treat leukotriene-mediated conditions, such as inflammation. LTA₄-h inhibitors have been described, for example, in U.S. Pat. No. 7,737,145 and U.S. Patent Application Publication No. 20100210630A1, the contents of each of which are incorporated by reference herein.

It would be advantageous to develop additional LTA₄-h inhibitors.

SUMMARY OF THE INVENTION

The present invention is directed to compounds encompassed by the Formula (I), pharmaceutical compositions thereof, methods for inhibiting LTA₄ hydrolase, and methods for the treatment of a disease and disorder which is ameliorated by the inhibition of LTA₄-h activity. Non-limiting examples of such diseases and conditions include inflammatory diseases and disorder, autoimmune diseases and disorders and cancer.

In one embodiment, the invention is directed to a compound having the Formula (I):

wherein: R is i) the group;

-   -   or     -   ii) the group;

-   -   or     -   iii) an optionally substituted heteroaryl;     -   n₁, n₂, and n₃ are each independently 0 to 2;     -   r is 0 to 4;     -   R^(1a), R^(1b), R^(1c), R^(1d) and R^(1e) are each independently         hydrogen, OR¹⁰, C(O)OR¹⁰, C(O)R¹⁰, optionally substituted C₁-C¹²         alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally         substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅         cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo,         cyano, optionally substituted aryl, optionally substituted         heteroaryl, or optionally substituted heterocyclyl;     -   R^(1v), R^(1w), R^(1x), R^(1y) and R^(1z) are each independently         hydrogen or fluoro;     -   R³ is a direct bond, —O—, —R¹²—O—, —O—R¹²—, —O—R¹² 13 O—, an         optionally substituted straight or branched C₁ to C12 alkylene         chain, an optionally substituted straight or branched C₂ to C₁₂         alkenylene chain, or an optionally substituted straight or         branched C₂ to C₁₂ alkynylene chain;     -   R⁴ is a direct bond, —O—R^(12a), an optionally substituted         straight or branched C₁ to C₁₂ alkylene chain, an optionally         substituted straight or branched C₂ to C₁₂ alkenylene chain, or         an optionally substituted straight or branched C₂ to C₁₂         alkynylene chain;     -   each R^(5a) and R^(6a) are each independently hydrogen and         optionally substituted alkyl;     -   or R^(5a) and R^(6a) together can be an oxo group;     -   R⁷ is hydrogen, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—N(R¹⁰)R¹¹,         N(R¹⁰)C(O)N(R¹⁰)R¹¹, optionally substituted C₁-C₁₂ alkyl,         optionally substituted C₂-C₁₂ alkenyl, optionally substituted         C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl,         optionally substituted C₃-C₁₅ cycloalkenyl, optionally         substituted aryl, optionally substituted heteroaryl, and         optionally substituted heterocyclyl;     -   each R⁹ is independently —OR¹⁰, optionally substituted C₁-C12         alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally         substituted C₂-C₁₂ alkynyl, halo, optionally substituted aryl,         or optionally substituted heteroaryl;     -   each R¹⁰ and R¹¹ is independently hydrogen, optionally         substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl,         optionally substituted C₂-C₁₂ alkynyl, optionally substituted         C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl,         optionally substituted aryl, optionally substituted heteroaryl,         and optionally substituted heterocyclyl;     -   or R¹⁰ and R¹¹, together with the nitrogen to which they are         attached, form an optionally substituted N-heterocyclyl or an         optionally substituted N-heteroaryl;     -   R¹² is an optionally substituted straight or branched C₁ to C₁₂         alkylene chain, an optionally substituted straight or branched         C₂ to C₁₂ alkenylene chain, or an optionally substituted         straight or branched C₂ to C₁₂ alkynylene chain;     -   R^(12a) is an optionally substituted straight or branched C₁ to         C₁₂ alkylene chain, an optionally substituted straight or         branched C₂ to C₁₂ alkenylene chain, or an optionally         substituted straight or branched C₂ to C₁₂ alkynylene chain;     -   each R¹³ is independently a direct bond, an optionally         substituted straight or branched C₁ to C₁₂ alkylene chain, an         optionally substituted straight or branched C₂ to C₁₂ alkenylene         chain, or an optionally substituted straight or branched C₃ to         C₁₂ alkynylene chain; and     -   R¹⁵ is an optionally substituted phenyl or an optionally         substituted pyridyl;     -   as a single stereoisomer or as a mixture of stereoisomers; or a         pharmaceutically acceptable salt, solvate, polymorph, clathrate,         ammonium ion, N-oxide or prodrug thereof.

In certain embodiments, the compound has the Formula (I), wherein R¹⁵ is an optionally substituted pyridyl.

In other aspects of the invention, the compound has the Formula (I), wherein R¹⁵ is an optionally substituted phenyl.

The invention is also directed to a pharmaceutical composition comprising a pharmaceutically acceptable excipient and a compound of Formula (I), as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof.

Also encompassed, is a method of treating a disease or disorder ameliorated by the inhibition of leukotriene A₄ (LTA₄) hydrolase activity in a mammal, wherein the method comprises administering to a mammal in need thereof a therapeutically effective amount of a compound of Formula (I), as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof. In some aspects, the disease or disorder is an inflammatory disorder or autoimmune disorder.

DETAILED DESCRIPTION OF THE INVENTION

A description of preferred embodiments of the invention follows.

As used herein, the words “a” and “an” are meant to include one or more unless otherwise specified. For example, the term “a cell” encompasses both a single cell and a combination of two or more cells.

As discussed above, the present invention is directed to compounds of Formula (I), as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, pharmaceutical compositions of any of thereof, and methods comprising administering a compound of the invention to a subject for the treatment of disorders and diseases that can be ameliorated by inhibition of LTA4-h.

In some embodiments, the invention is directed to a compound of Formula (I), as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein R¹⁵ has the structure shown below:

wherein each R¹⁶ is independently selected from the group consisting of hydrogen, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl, OR¹⁰, NO₂, S(O)_(j)R₁₀, S(O)_(j)NR¹⁰R¹¹, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—N(R¹⁰)R¹¹, N(R¹⁰)C(O)N(R¹⁰)R¹¹, N(R¹⁰)R¹¹, and N(R₁₀)C(O)R₁₀; wherein w is an integer from 1 to 4; and wherein j is 0, 1 or 2. In a specific example, R¹⁵ has the structure:

In some embodiments, R¹⁶ is selected from the group consisting of an optionally substituted heterocyclyl containing one or more ring nitrogen atoms, an optionally substituted heteroaryl containing one or more nitrogen atoms, NR₁₀R₁₁ and OR₁₀. In additional aspects of the invention, R¹⁶ is OR¹⁰, and wherein R¹⁰ is selected from the group consisting of optionally substituted phenyl. In yet another embodiment, R¹⁶ is an N-heterocyclyl. In a further embodiment, R¹⁶ is the group:

wherein each R¹⁸ is independently selected from the group consisting of hydrogen, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl, OR¹⁰, NO₂, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—N(R¹⁰)R¹¹, N(R¹⁰)C(O)N(R¹⁰)R¹¹, NR₁₀R₁₁, and N(R₁₀)C(O)R₁₀; and z is an integer from 0 to 5. In yet another aspect of the invention, R¹⁶ has the structure:

In an additional aspect, the invention is directed to a compound of Formula (I), as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein R¹⁴ is phenyl optionally substituted with one or more R¹⁷, wherein R¹⁷ is selected from the group consisting of hydrogen, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl, OR¹⁰, NO₂, S(O)_(j)R₁₀, S(O)_(j)NR¹⁰R¹¹, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—NR¹⁰R¹¹, NR¹⁰C(O)NR¹⁰R¹¹, NR¹⁰R¹¹, and NR₁₀C(O)R₁₀. In certain embodiments, R¹⁷ is selected from the group consisting of an optionally substituted heterocyclic containing one or more ring nitrogen atoms, an optionally substituted heteroaryl containing one or more nitrogen atoms, NR¹⁰R¹¹ and OR₁₀. In additional embodiments, R¹⁷ is OR¹⁰ and wherein R¹⁰ is an optionally substituted phenyl. In yet another aspect, R¹⁷ is an optionally substituted N-heterocyclyl.

The invention additionally encompasses a compound described herein, as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein each of R^(5a) and R^(6a) are each independently hydrogen, alkyl, haloalkyl or hydroxyalkyl.

In some embodiments, the invention is a compound described herein, as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein R is the group:

In certain embodiments, R^(1a) is hydrogen, C(O)OR¹⁰, C(O)R¹⁰, C(O)NR¹⁰R¹¹, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, and optionally substituted heterocyclyl. In additional aspects, R^(1a) is hydrogen, C(O)OR¹⁰, C(O)R¹⁰, C(O)NR¹⁰R¹¹, optionally substituted alkyl, halo, optionally substituted phenyl, furanyl, thienyl, thiazolyl, or optionally substituted oxazolyl; and wherein R^(1b), R^(1c), R^(1d) and R^(1e) are each hydrogen. In yet additional embodiments, R^(1a) is halo. In additional aspects, R^(1a) is oxazolyl or thiazolyl.

In additional embodiments, the invention is a compound described herein, as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein, R is the group:

In yet another aspect, the invention is a compound described herein, as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein R is an optionally substituted heteroaryl. In certain aspects, R is furanyl, oxazolyl, pyrazolyl, pyridinyl, triazolyl, thiazolyl, or benzothiazolyl, each of which is optionally substituted.

In yet additional aspects, the invention is a compound described herein, as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein R³ is O.

In additional embodiments, the invention is a compound described herein as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein R⁴ is a direct bond, an optionally substituted methylene or an optionally substituted ethylene. In some embodiments, R⁴ is methylene. In some embodiments, R⁴ is a direct bond. In yet additional embodiments, R⁴ is a direct bond and R¹⁵ is optionally substituted phenyl. In another embodiment, R⁴ is a direct bond and R¹⁵ is phenyl optionally substituted with C(O)OR¹⁰, C(O)R¹⁰, or C(O)NR¹⁰R¹¹.

The invention also encompasses a compound described herein, as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt, solvate, polymorph, clathrate, ammonium ion, N-oxide or prodrug thereof, wherein R⁷ is hydrogen or optionally substituted C₁-C₆ alkyl. In certain aspects, R⁷ is hydrogen or alkyl optionally substituted with OR¹⁰, or alkyl optionally substituted with NR¹⁰R¹¹. In yet additional aspects, R⁷ is hydrogen or methyl.

Non-limiting examples of compounds encompassed by the invention are shown in Tables 1 to 3 below.

TABLE 1

Compound No. X Y  1

 2

 3

 4

 5

 6

 7

 8

 9

10

11

12

13

14

15

16

17

18

19

20

21

TABLE 2

Compound No. X Y 22

H 23

CH₂CH₂—OMe 24

Me 25

H 26

Me 27

Me 28

H 29

H 30

H 31

H 32

H 33

H 34

H 35

H 36

H 37 (S-isomer)

H 38 (R-isomer)

H 39

H 40

H

TABLE 3

Compound No. X Y 41 H

42 H

43 H

44 H

It is to be understood that the specific embodiments described herein can be taken in combination with other specific embodiments delineated herein. It will be appreciated that the description of the present invention herein should be construed in congruity with the laws and principals of chemical bonding.

“Alkyl” refers to a straight or branched hydrocarbon chain radical consisting solely of carbon and hydrogen atoms, containing no unsaturation and which is attached to the rest of the molecule by a single bond. In some embodiments, an alkyl group has from one to twelve carbon atoms, one to eight carbon atoms, or one to six carbon atoms. Non-limiting examples of alkyl groups include methyl, ethyl, n-propyl, 1-methylethyl (iso-propyl), n-butyl, n-pentyl, 1,1-dimethylethyl (t-butyl), 3-methylhexyl, 2-methylhexyl, and the like. An optionally substituted alkyl group can by an alkyl group substituted with one or more substituents described in detail below. Non-limiting examples of optionally substituted alkyls include haloalkyl, alkyl substituted with cyano, optionally substituted aralkyl, optionally substituted heteroarylalkyl, optionally substituted cycoalklylalkyl, optionally substituted heterocycloalkyl, alkyl substituted with an amino group, alkyls substituted with hydroxyl or alkoxy, and the like.

“Alkenyl” refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one double bond. In some cases, an alkenyl can have from two to twelve carbon atoms, or two to eight carbon atoms. An alkenyl is attached to the rest of the molecule by a single bond, for example, ethenyl, prop-1-enyl, but-1-enyl, pent-1-enyl, penta-1,4-dienyl, and the like. An optionally substituted alkenyl group can by an alkyl group substituted with one or more substituents described in detail below.

“Alkynyl” refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one triple bond, optionally containing at least one double bond. In some embodiments, an alkynyl can have from two to twelve carbon atoms, or two to eight carbon atoms. An alkynyl is attached to the rest of the molecule by a single bond, for example, ethynyl, propynyl, butynyl, pentynyl, hexynyl, and the like. An optionally substituted alkynyl group can by an alkyl group substituted with one or more substituents described in detail below.

“Alkylene” or “alkylene chain” refers to a straight or branched divalent hydrocarbon chain linking the rest of the molecule to a radical group, consisting solely of carbon and hydrogen, containing no unsaturation and having from one to twelve carbon atoms, for example, methylene, ethylene, propylene, n-butylene, and the like. The alkylene chain is attached to the rest of the molecule through a single bond and to the radical group through a single bond. The points of attachment of the alkylene chain to the rest of the molecule and to the radical group can be through one carbon in the alkylene chain or through any two carbons within the chain. An alkylene chain can be substituted or unsubstituted.

“Alkenylene” or “alkenylene chain” refers to a straight or branched divalent hydrocarbon chain linking the rest of the molecule to a radical group, consisting solely of carbon and hydrogen, containing at least one double bond and having from two to twelve carbon atoms, for example, ethenylene, propenylene, n-butenylene, and the like. The alkenylene chain is attached to the rest of the molecule through a double bond or a single bond and to the radical group through a double bond or a single bond. The points of attachment of the alkenylene chain to the rest of the molecule and to the radical group can be through one carbon or any two carbons within the chain.

“Alkynylene” or “alkynylene chain” refers to a straight or branched divalent hydrocarbon chain linking the rest of the molecule to a radical group, consisting solely of carbon and hydrogen, containing at least one triple bond and having from two to twelve carbon atoms, for example, propynylene, n-butynylene, and the like. The alkynylene chain is attached to the rest of the molecule through a single bond and to the radical group through a double bond or a single bond. The points of attachment of the alkynylene chain to the rest of the molecule and to the radical group can be through one carbon or any two carbons within the chain.

“Alkoxy” refers to a radical of the formula —OR_(a) where R_(a) is an optionally substituted alkyl radical as defined above containing one to twelve carbon atoms.

“Alkoxyalkyl” refers to a radical of the formula —R_(a)—O—R_(a) where each R_(a) is independently an optionally substituted alkyl radical as defined above. The oxygen atom may be bonded to any carbon in either alkyl radical.

“Aryl” refers to aromatic monocyclic or multicyclic hydrocarbon ring system consisting only of hydrogen and carbon and containing from 6 to 19 carbon atoms, where the ring system may be partially or fully saturated. Aryl groups include, but are not limited to, groups such as fluorenyl, phenyl and naphthyl.

“Aralkyl” refers to a radical of the formula —R_(a)-R_(b) where R_(a) is an optionally substituted alkyl radical and R_(b) is one or more optionally substituted aryl radicals, for example, benzyl, diphenylmethyl and the like. “Aralkenyl” refers to a radical of the formula —R_(c)-R_(b) where R_(c) is an optionally substituted alkenyl radical and R_(b) is one or more optionally substituted aryl radicals. “Aralkynyl” refers to a radical of the formula —R_(d)-R_(b) where R_(d) is an optionally substituted alkynyl radical and R_(b) is one or more optionally substituted aryl radicals.

“Aryloxy” refers to a radical of the formula —OR_(b) where R_(b) is an optionally substituted aryl group. “Aralkyloxy” refers to a radical of the formula —OR_(b) where R_(b) is an aralkyl group. The aralkyl part of the aralkyloxy radical may be optionally substituted.

“Ammonium ion” refers to a nitrogen within a compound of the invention containing a positive charge due to the additional substitution of the nitrogen with an optionally substituted alkyl group as defined above.

“Amino” refers to the —NH₂ radical.

“Cyano” refers to the —CN radical.

“Hydroxy” refers to the —OH radical.

“Nitro” refers to the —NO₂ radical.

“Oxo” refers to the C(O) radical.

“Clathrates” as used herein refers to substances which fix gases, liquids or compounds as inclusion complexes so that the complex may be handled in solid form and the included constituent (or “guest” molecule) is subsequently released by the action of a solvent or by melting. The term “clathrate” is used interchangeably herein with the phrase “inclusion molecule” or with the phrase “inclusion complex”. Clathrates used in the instant invention are prepared from cyclodextrins. Cyclodextrins are widely known as having the ability to form clathrates (i.e., inclusion compounds) with a variety of molecules. See, for example, Inclusion Compounds, edited by J. L. Atwood, J. E. D. Davies, and D. D. MacNicol, London, Orlando, Academic Press, 1984; Goldberg, I., “The Significance of Molecular Type, Shape and Complementarity in Clathrate Inclusion”, Topics in Current Chemistry (1988), Vol. 149, pp. 2-44; Weber, E. et al., “Functional Group Assisted Clathrate Formation—Scissor-Like and Roof-Shaped Host Molecules”, Topics in Current Chemistry (1988), Vol. 149, pp. 45-135; and MacNicol, D. D. et al., “Clathrates and Molecular Inclusion Phenomena”, Chemical Society Reviews (1978), Vol. 7, No. 1, pp. 65-87. Conversion into cyclodextrin clathrates is known to increase the stability and solubility of certain compounds, thereby facilitating their use as pharmaceutical agents. See, for example, Saenger, W., “Cyclodextrin Inclusion Compounds in Research and Industry”, Angew. Chem. Int. Ed. Engl. (1980), Vol. 19, pp. 344-362; U.S. Pat. No. 4,886,788 (Schering AG); U.S. Pat. No. 6,355,627 (Takasago); U.S. Pat. No. 6,288,119 (Ono Pharmaceuticals); U.S. Pat. No. 6,110,969 (Ono Pharmaceuticals); U.S. Pat. No. 6,235,780 (Ono Pharmaceuticals); U.S. Pat. No. 6,262,293 (Ono Pharmaceuticals); U.S. Pat. No. 6,225,347 (Ono Pharmaceuticals); and U.S. Pat. No. 4,935,446 (Ono Pharmaceuticals).

“Cyclodextrin” refers to cyclic oligosaccharides consisting of at least six glucopyranose units which are joined together by alpha (1-4) linkages. The oligosaccharide ring forms a torus with the primary hydroxyl groups of the glucose residues lying on the narrow end of the torus. The secondary glucopyranose hydroxyl groups are located on the wider end. Cyclodextrins have been shown to form inclusion complexes with hydrophobic molecules in aqueous solutions by binding the molecules into their cavities. The formation of such complexes protects the “guest” molecule from loss of evaporation, from attack by oxygen, visible and ultraviolet light and from intra- and intermolecular reactions. Such complexes also serve to “fix” a volatile material until the complex encounters a warm moist environment, at which point the complex will dissolve and dissociate into the guest molecule and the cyclodextrin. For purposes of this invention, the six-glucose unit containing cyclodextrin is specified as α-cyclodextrin, while the cyclodextrins with seven and eight glucose residues are designated as β-cyclodextrin and γ-cyclodextrin, respectively. The most common alternative to the cyclodextrin nomenclature is the naming of these compounds as cycloamyloses.

“Cycloalkyl” refers to a stable non-aromatic monocyclic or polycyclic hydrocarbon radical consisting solely of carbon and hydrogen atoms, which may include fused or bridged ring systems, having from three to fifteen carbon atoms, and which is saturated or unsaturated and attached to the rest of the molecule by a single bond. In some aspects, a cycloalkyl will have from three to ten carbon atoms. Monocyclic radicals include, for example, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl. Polycyclic radicals include, for example, adamantine, norbornane, 7,7-dimethyl-bicyclo[2.2.1]heptanyl, and the like.

“Cycloalkenyl” refers to monocyclic or polycyclic hydrocarbon alkenyl moiety having 3 to fifteen carbon atoms.

The term “cycloalkynyl,” refers to a monocyclic or polycyclic alkynyl moiety having 5 to 15 more carbon atoms.

“Cycloalkylalkyl” refers to a radical of the formula —R_(a)-R_(e) where R_(a) is an optionally substituted alkyl radical as defined above and R_(e) is an optionally substituted cycloalkyl radical as defined above. “Cycloalkylalkenyl” refers to a radical of the formula —R_(c)-R_(e) where R_(c) is an optionally substituted alkenyl radical as defined above and R_(e) is an optionally substituted cycloalkyl radical as defined above. “Cycloalkylalkynyl” refers to a radical of the formula —R_(d)-R_(e) where R_(d) is an optionally substituted alkynyl radical as defined above and R_(e) is an optionally substituted cycloalkyl radical as defined above.

“Halo” refers to bromo, chloro, fluoro or iodo.

“Haloalkyl” refers to an alkyl radical, as defined above, that is substituted by one or more halo radicals, as defined above, for example, trifluoromethyl, difluoromethyl, trichloromethyl, 2,2,2-trifluoroethyl, 1-fluoromethyl-2-fluoroethyl, 3-bromo-2-fluoropropyl, 1-bromomethyl-2-bromoethyl, and the like. The alkyl part of the haloalkyl radical may be optionally substituted.

“Haloalkenyl” refers to an alkenyl radical, as defined above, that is substituted by one or more halo radicals, as defined above. The alkenyl part of the haloalkyl radical may be optionally substituted. “Haloalkynyl” refers to an alkynyl radical, as defined above, that is substituted by one or more halo radicals, as defined above. The alkynyl part of the haloalkyl radical may be optionally substituted.

“Heterocyclyl” and “heterocyclic” refer to a stable 3- to 18-membered non-aromatic ring radical which includes one to six heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur. Unless stated otherwise specifically in the specification, the heterocyclyl radical may be a monocyclic, bicyclic, tricyclic or tetracyclic ring system, which may include fused or bridged ring systems; and the nitrogen, carbon or sulfur atoms in the heterocyclyl radical may be optionally oxidized; the nitrogen atom may be optionally quaternized; and the heterocyclyl radical may be partially or fully saturated. Examples of such heterocyclyl radicals include, but are not limited to, azepinyl, 2,5-diazabicyclo[2.2.1]heptan-2-yl, hexahydro-1H-1,4-diazepinyl, dioxolanyl, thienyl[1,3]dithianyl, decahydroisoquinolyl, imidazolinyl, imidazolidinyl, isothiazolidinyl, isoxazolidinyl, morpholinyl, octahydroindolyl, octahydroisoindolyl, 2-oxopiperazinyl, 2-oxopiperidinyl, 2-oxopyrrolidinyl, oxiranyl, oxazolidinyl, piperidinyl, piperazinyl, 4-piperidonyl, pyrrolidinyl, pyrazolidinyl, quinuclidinyl, thiazolidinyl, tetrahydrofuryl, trithianyl, tetrahydropyranyl, thiomorpholinyl, thiamorpholinyl, 1-oxo-thiomorpholinyl, and 1,1-dioxo-thiomorpholinyl.

“N-heterocyclyl” refers to a heterocyclyl radical as defined above containing at least one nitrogen and where the point of attachment of the heterocyclyl radical to the rest of the molecule is through a nitrogen atom in the heterocyclyl radical. An N-heterocyclyl radical may be optionally substituted.

“Heterocyclylalkyl,” refers to a radical of the formula —R_(a)-R_(f) where R_(a) is an optionally substituted alkyl radical as defined above and R_(f) is an optionally substituted heterocyclyl radical as defined above, and if the heterocyclyl is a nitrogen-containing heterocyclyl, the heterocyclyl can be attached to the alkyl radical at the nitrogen atom or a carbon atom. “Heterocyclylalkenyl” refers to a radical of the formula —R_(c)-R_(f) where R_(c) is an optionally substituted alkenyl radical as defined above and R_(f) is an optionally substituted heterocyclyl radical as defined above, and if the heterocyclyl is a nitrogen-containing heterocyclyl, the heterocyclyl may be attached to the alkenyl radical at the nitrogen atom or at the carbon atom. “Heterocyclylalkynyl” refers to a radical of the formula —R_(d)-R_(f) where R_(d) is an optionally substituted alkynyl radical as defined above and R_(f) is an optionally substituted heterocyclyl radical as defined above, and if the heterocyclyl is a nitrogen-containing heterocyclyl, the heterocyclyl can be attached to the alkynyl radical at the nitrogen atom or at a carbon atom.

“Heteroaryl” refers to a 3- to 18-membered fully or partially aromatic ring radical which consists of one to thirteen carbon atoms and from one to six heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur. For purposes of this invention, the heteroaryl radical may be a monocyclic, bicyclic, tricyclic or tetracyclic ring system, which may include fused or bridged ring systems; the nitrogen, carbon or sulfur atoms in the heteroaryl radical may be optionally oxidized; and the nitrogen atom may be optionally quaternized. Examples include, but are not limited to, acridinyl, benzimidazolyl, benzindolyl, benzodioxolyl, benzofuranyl, benzooxazolyl, benzothiazolyl, benzothiadiazolyl, benzo[b][1,4]dioxepinyl, 1,4-benzodioxanyl, benzonaphthofuranyl, benzoxazolyl, benzodioxolyl, benzodioxinyl, benzopyranyl, benzopyranonyl, benzofuranyl, benzofuranonyl, benzothienyl (benzothiophenyl), benzotriazolyl, benzo[4,6]imidazo[1,2-a]pyridinyl, carbazolyl, cinnolinyl, dibenzofuranyl, dibenzothiophenyl, furanyl, furanonyl, isothiazolyl, imidazolyl, indazolyl, indolyl, isoindolyl, indolinyl, isoindolinyl, indolizinyl, isoxazolyl, naphthyridinyl, oxadiazolyl, 2-oxoazepinyl, oxazolyl, phenazinyl, phenothiazinyl, phenoxazinyl, phthalazinyl, pteridinyl, purinyl, pyrazolyl, pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, pyrrolyl, quinazolinyl, quinoxalinyl, quinolinyl, isoquinolinyl, tetrahydroquinolinyl, thiazolyl, thiadiazolyl, triazolyl, tetrazolyl, triazinyl, and thiophenyl (i.e. thienyl).

“N-heteroaryl” refers to an optionally substituted heteroaryl radical as defined above containing at least one nitrogen and where the point of attachment of the heteroaryl radical to the rest of the molecule is through a nitrogen atom in the heteroaryl radical.

“Heteroarylalkyl” refers to a radical of the formula —R_(a)-R_(g) where R_(a) is an optionally substituted alkyl radical as defined above and R_(g) is an optionally substituted heteroaryl radical as defined above. “Heteroarylalkenyl” refers to a radical of the formula —R_(c)-R_(g) where R_(c) is an optionally substituted alkenyl radical as defined above and R_(g) is an optionally substituted heteroaryl radical as defined above. “Heteroarylalkynyl” refers to a radical of the formula —R_(d)-R_(g) where R_(d) is an optionally substituted alkynyl radical as defined above and R_(g) is an optionally substituted heteroaryl radical as defined above.

The term “substituted” refers to substitution by independent replacement of one, two, or three or more of the hydrogen atoms with substituents including, but not limited to, —C₁-C₁₂ alkyl, —C₂-C₁₂ alkenyl, —C₂-C₁₂ alkynyl, —C₃-C₁₅ cycloalkyl, —C₃-C₁₅ cycloalkenyl, C₃-C₁₅ cycloalkynyl, -heterocyclic, —F, —Cl, —Br, —I, —OH, —NO₂, —N₃, —CN, —NH₂, oxo, thioxo, —NHR_(x), —NR_(x)R_(x), dialkylamino, -diarylamino, -diheteroarylamino, —OR_(x), —C(O)OR_(y), —C(O)R_(y), —C(O)C(O)R_(y), —OCO₂R_(y), —OC(O)R_(y), OC(O)C(O)R_(y), —NHC(O)R_(y), —NHCO₂R_(y), —NHC(O)C(O)R_(y), —NHC(S)NH₂, —NHC(S)NHR_(x), —NHC(NH)NH₂, —NHC(NH)NHR_(x), —NHC(NH)R_(x), —C(NH)NHR_(x), —NR_(x)C(O)R_(x), —NR_(x)CO₂R_(y), —NR_(x)C(O)C(O)R_(y), —NR_(x)C(S)NH₂, —NR_(x)C(O)NR_(x)R_(x), —NR_(x)S(O)₂NR_(x)R_(x), —NR_(x)C(S)NHR_(x), —NR_(x)C(NH)NH₂, —NR_(x)C(NH)NHR_(x), —NR_(x)C(NH)R_(x), —C(NR_(x))NHR_(x)—S(O)_(n)R_(y), —NHSO₂R_(x), —CH₂NH₂, —CH₂SO₂CH₃, —(C═NR_(x))R_(x); -aryl, -arylalkyl, -heteroaryl, -heteroarylalkyl, -heterocycloalkyl, —C₃-C₁₅-cycloalkyl, -polyalkoxyalkyl, -polyalkoxy, -methoxymethoxy, -methoxyethoxy, —SH, —S—R_(x), or -methylthiomethyl, wherein R_(x) is selected from the group consisting of hydrogen, —C₁-C₁₂ alkyl, —C₂-C₁₂ alkenyl, —C₂-C₁₂ alkynyl, —C₃-C₁₅ cycloalkyl, -aryl, -heteroaryl and -heterocyclic; —R_(y) is selected from the group consisting of hydrogen, —C₁-C₁₂ alkyl, —C₂-C₁₂ alkenyl, —C₂-C₁₂ alkynyl, —C₃-C₁₅ cycloalkyl, -aryl, -heteroaryl, -heterocyclic, —NH₂, —NH—C₁-C₁₂ alkyl, —NH—C₂-C₁₂ alkenyl, —NH—C₂-C₁₂-alkynyl, —NH—C₃-C₁₅ cycloalkyl, —NH-aryl, —NH-heteroaryl and —NH-heterocyclic, and n is 0, 1 or 2. It is understood that the aryls, heteroaryls, alkyls, cycloalkyls, heterocyclics and the like can be further substituted.

“Polymorph” refers to a polymorphic form of compound of the invention. Solids exist in either amorphous or crystalline forms. In the case of crystalline forms, molecules are positioned in 3-dimensional lattice sites. When a compound recrystallizes from a solution or slurry, it may crystallize with different spatial lattice arrangements, a property referred to as “polymorphism,” with the different crystal forms individually being referred to as a “polymorph”. Different polymorphic forms of a given substance may differ from each other with respect to one or more physical properties, such as solubility and dissociation, true density, crystal shape, compaction behavior, flow properties, and/or solid state stability. In the case of a chemical substance that exists in two (or more) polymorphic forms, the unstable forms generally convert to the more thermodynamically stable forms at a given temperature after a sufficient period of time. When this transformation is not rapid, the thermodynamically unstable form is referred to as the “metastable” form. In general, the stable form exhibits the highest melting point, the lowest solubility, and the maximum chemical stability. However, the metastable form may exhibit sufficient chemical and physical stability under normal storage conditions to permit its use in a commercial form. In this case, the metastable form, although less stable, may exhibit properties desirable over those of the stable form, such as enhanced solubility or better oral bioavailability.

“Prodrug” is meant to indicate a compound that may be converted under physiological conditions or by solvolysis to a biologically active compound of the invention. Thus, the term “prodrug” refers to a metabolic precursor of a compound of the invention that is pharmaceutically acceptable. A prodrug may be inactive when administered to a subject in need thereof, but is converted in vivo to an active compound of the invention. Prodrugs are typically rapidly transformed in vivo to yield the parent compound of the invention, for example, by hydrolysis in blood. The prodrug compound often offers advantages of solubility, tissue compatibility or delayed release in a mammalian organism (see, Bundgard, H., Design of Prodrugs (1985), pp. 7-9, 21-24 (Elsevier, Amsterdam). A discussion of prodrugs is provided in Higuchi, T., et al., “Pro-drugs as Novel Delivery Systems,” A.C.S. Symposium Series, Vol. 14, and in Bioreversible Carriers in Drug Design, ed. Edward B. Roche, American Pharmaceutical Association and Pergamon Press, 1987, both of which are incorporated in full by reference herein. The term “prodrug” is also meant to include any covalently bonded carriers, which release the active compound of the invention in vivo when such prodrug is administered to a mammalian subject. Prodrugs of a compound of the invention may be prepared by modifying functional groups present in the compound of the invention in such a way that the modifications are cleaved, either in routine manipulation or in vivo, to the parent compound of the invention. Prodrugs include compounds of the invention wherein a hydroxy, amino or mercapto group is bonded to any group that, when the prodrug of the compound of the invention is administered to a mammalian subject, cleaves to form a free hydroxy, free amino or free mercapto group, respectively. Examples of prodrugs include, but are not limited to, acetate, formate and benzoate derivatives of alcohol or amine functional groups in the compounds of the invention and the like.

“Stable compound” and “stable structure” are meant to indicate a compound that is sufficiently robust to survive isolation to a useful degree of purity from a reaction mixture, and formulation into an efficacious therapeutic agent.

“Mammal” includes humans and domestic animals, such as cats, dogs, swine, cattle, sheep, goats, horses, rabbits, and the like. In some embodiments, the mammal is a human.

“Optional” or “optionally” means that the subsequently described event of circumstances may or may not occur, and that the description includes instances where said event or circumstance occurs and instances in which it does not. For example, “optionally substituted aryl” means that the aryl radical may or may not be substituted and that the description includes both substituted aryl radicals and aryl radicals having no substitution.

“Pharmaceutically acceptable excipient” includes without limitation any adjuvant, carrier, excipient, glidant, sweetening agent, diluent, preservative, dye/colorant, flavor enhancer, surfactant, wetting agent, dispersing agent, suspending agent, stabilizer, isotonic agent, solvent, or emulsifier which, for example, has been approved by the United States Food and Drug Administration as being acceptable for use in humans or domestic animals.

“Pharmaceutically acceptable salt” includes both acid and base addition salts.

“Pharmaceutically acceptable acid addition salt” refers to those salts which retain the biological effectiveness and properties of the free bases, which are not biologically or otherwise undesirable, and which are formed with inorganic acids such as, but not limited to, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like, and organic acids such as, but not limited to, acetic acid, 2,2-dichloroacetic acid, adipic acid, alginic acid, ascorbic acid, aspartic acid, benzenesulfonic acid, benzoic acid, 4-acetamidobenzoic acid, camphoric acid, camphor-10-sulfonic acid, capric acid, caproic acid, caprylic acid, carbonic acid, cinnamic acid, citric acid, cyclamic acid, dodecylsulfuric acid, ethane-1,2-disulfonic acid, ethanesulfonic acid, 2-hydroxyethanesulfonic acid, formic acid, fumaric acid, galactaric acid, gentisic acid, glucoheptonic acid, gluconic acid, glucuronic acid, glutamic acid, glutaric acid, 2-oxo-glutaric acid, glycerophosphoric acid, glycolic acid, hippuric acid, isobutyric acid, lactic acid, lactobionic acid, lauric acid, maleic acid, malic acid, malonic acid, mandelic acid, methanesulfonic acid, mucic acid, naphthalene-1,5-disulfonic acid, naphthalene-2-sulfonic acid, 1-hydroxy-2-naphthoic acid, nicotinic acid, oleic acid, orotic acid, oxalic acid, palmitic acid, pamoic acid, propionic acid, pyroglutamic acid, pyruvic acid, salicylic acid, 4-aminosalicylic acid, sebacic acid, stearic acid, succinic acid, tartaric acid, thiocyanic acid, p-toluenesulfonic acid, trifluoroacetic acid, undecylenic acid, and the like.

“Pharmaceutically acceptable base addition salt” refers to those salts which retain the biological effectiveness and properties of the free acids, which are not biologically or otherwise undesirable. These salts are prepared from addition of an inorganic base or an organic base to the free acid. Salts derived from inorganic bases include, but are not limited to, the sodium, potassium, lithium, ammonium, calcium, magnesium, iron, zinc, copper, manganese, aluminum salts and the like. Preferred inorganic salts are the ammonium, sodium, potassium, calcium, and magnesium salts. Salts derived from organic bases include, but are not limited to, salts of primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines and basic ion exchange resins, such as ammonia, isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, diethanolamine, ethanolamine, deanol, 2-dimethylaminoethanol, 2-diethylaminoethanol, dicyclohexylamine, lysine, arginine, histidine, caffeine, procaine, hydrabamine, choline, betaine, benethamine, benzathine, ethylenediamine, glucosamine, methylglucamine, theobromine, triethanolamine, tromethamine, purines, piperazine, piperidine, N-ethylpiperidine, polyamine resins and the like. Particularly preferred organic bases are isopropylamine, diethylamine, ethanolamine, trimethylamine, dicyclohexylamine, choline and caffeine.

A “pharmaceutical composition” refers to a formulation of a compound of the invention and a medium generally accepted in the art for the delivery of the biologically active compound to mammals, for example, humans. Such a medium includes all pharmaceutically acceptable carriers, diluents or excipients.

“Solvate” refers to an aggregate that comprises one or more molecules of a compound of the invention with one or more molecules of solvent. The solvent may be water, in which case the solvate may be a hydrate. Alternatively, the solvent may be an organic solvent. Thus, the compounds of the present invention may exist as a hydrate, including a monohydrate, dihydrate, hemihydrate, sesquihydrate, trihydrate, tetrahydrate and the like, as well as the corresponding solvated forms. The compound of the invention may be true solvates, while in other cases, the compound of the invention may merely retain adventitious water or be a mixture of water plus some adventitious solvent.

“Therapeutically effective amount” refers to that amount of a compound of the invention that, when administered to a mammal, preferably a human, is sufficient to effect treatment, as defined below, of a disease or condition of interest in the mammal, preferably a human. The amount of a compound of the invention which constitutes a “therapeutically effective amount” will vary depending on, for example, the activity of the specific compound employed; the metabolic stability and length of action of the compound; the age, body weight, general health, sex, and diet of the patient; the mode and time of administration; the rate of excretion; the drug combination; the severity of the particular disorder or condition; and the subject undergoing therapy, but it can be determined routinely by one of ordinary skill in the art having regard to his own knowledge and to this disclosure.

“Treating” or “treatment” as used herein covers the treatment of the disease or condition of interest in a mammal, preferably a human, having the disease or condition of interest, and includes, for example: (i) preventing the disease or condition from occurring in a mammal, in particular, when such mammal is predisposed to the condition but has not yet been diagnosed as having it; (ii) inhibiting the disease or condition, i.e., arresting its development; (iii) relieving the disease or condition, i.e., causing regression of the disease or condition; and/or (iv) stabilizing the disease or condition.

As used herein, the terms “disease” and “condition” may be used interchangeably or may be different in that the particular malady or condition may not have a known causative agent (so that etiology has not yet been worked out) and it is therefore not yet recognized as a disease but only as an undesirable condition or syndrome, wherein a more or less specific set of symptoms have been identified by clinicians.

The compounds of the invention, or their pharmaceutically acceptable salts may contain one or more asymmetric centers and may thus give rise to enantiomers, diastereomers, and other stereoisomeric forms that may be defined, in terms of absolute stereochemistry, as (R)— or (S)— or, as (D)- or (L)- for amino acids. The present invention is meant to include all such possible isomers, as well as their racemic and optically pure forms. Optically active (+) and (−), (R)— and (S)—, or (D)- and (L)-isomers may be prepared using chiral synthons or chiral reagents, or resolved using conventional techniques, such as for example, but not limited to, HPLC using a chiral column. When the compounds described herein contain olefinic double bonds or other centres of geometric asymmetry, and unless specified otherwise, it is intended that the compounds include both E and Z geometric isomers. Likewise, all tautomeric forms are also intended to be included.

A “stereoisomer” refers to a compound made up of the same atoms bonded by the same bonds but having different three-dimensional structures, which are not interchangeable. The present invention contemplates various stereoisomers and mixtures thereof and includes “enantiomers”, which refers to two stereoisomers whose molecules are nonsuperimposeable mirror images of one another.

A “tautomer” refers to a proton shift from one atom of a molecule to another atom of the same molecule. The present invention includes tautomers of any said compounds.

Compounds of the invention can be prepared using methods that have been described in the literature, for example, in U.S. Pat. No. 7,737,145 and U.S. Patent Application Publication No. 20100210630A1, the contents of each of which are expressly incorporated by reference herein. As will be understood by the skilled artisan, diastereomers can be separated from the reaction mixture using column chromatography.

The following Reaction Scheme illustrates a method to make a compound 22. This scheme is illustrative of methods of preparing compounds of Formula (I):

It will be appreciated by those skilled in the art that in the methods described herein the functional groups of intermediate compounds may need to be protected by suitable protecting groups. Such functional groups include hydroxy, amino, mercapto and carboxylic acid. Suitable protecting groups for hydroxy include trialkylsilyl or diarylalkylsilyl (for example, t-butyldimethylsilyl, t-butyldiphenylsilyl or trimethylsilyl), tetrahydropyranyl, benzyl, and the like. Suitable protecting groups for amino, amidino and guanidino include t-butoxycarbonyl, benzyloxycarbonyl, and the like. Suitable protecting groups for mercapto include —C(O)R″ (wherein R″ is alkyl, aryl or arylalkyl), p-methoxybenzyl, trityl and the like. Suitable protecting groups for carboxylic acid include alkyl, aryl or arylalkyl esters.

Protecting groups can be added or removed in accordance with standard techniques, which are known to one skilled in the art and as described herein. The use of protecting groups is described in detail in Greene, T. W. and P. G. M. Wuts, Protective Groups in Organic Synthesis (1999), 3rd Ed., Wiley. As one of skill in the art would appreciate, the protecting group may also be a polymer resin such as a Wang resin, Rink resin or a 2-chlorotrityl-chloride resin.

It will also be appreciated by those skilled in the art, although such protected derivatives of compounds of this invention may not possess pharmacological activity as such, they may be administered to a mammal and thereafter metabolized in the body to form compounds of the invention which are pharmacologically active. Such derivatives may therefore be described as “prodrugs”. All prodrugs of compounds of this invention are included within the scope of the invention.

It is understood that one of ordinary skill in the art would be able to make the compounds of the invention by methods similar to the methods described herein or by methods known to one of ordinary skill in the art. In general, compounds employed as initial starting materials in the synthesis of the compounds of the invention are well known and commercially available. To the extent that the compounds employed as initial starting materials are not commercially available, the compounds may be readily synthesized using specific references provided, or by standard procedures commonly employed by those of ordinary skill in the art and/or found in general references text (see, for example, Comprehensive Organic Transformations, VCH Publishers Inc., 1989; Compendium of Organic Synthetic Methods, Volumes 1-10, 1974-2002, Wiley Interscience; Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 5th edition, Wiley Interscience, 2001; Advanced Organic Chemistry, 4th Edition, Part B, Reactions and Synthesis, Kluwer Academic/Plenum Publishers, 2000, etc., and references cited therein).

The following common abbreviations are used:

-   DMF for N,N-dimethylformamide -   THF for tetrahydrofuran -   TFA for trifluoroacetic acid -   EtOAc for ethyl acetate -   TMS for trimethylsilyl -   TLC for thin layer chromatography -   MeOH for methanol -   NaOH for sodium hydroxide -   Boc for t-butoxycarbonyl.

The compounds of the invention can be tested for their ability to inhibit LTA₄-h by various known assays and by assays described herein. For example, the compounds can be tested for their ability to inhibit LTA₄-h activity by assaying the compounds in the hydrolase-homogeneous time resolved fluoroescence assay. This assay, which is a two-step assay, measures the hydrolysis of LTA₄-h to LTB₄ by analyzing the amount of LTB₄ produced. The first step involves the enzymatic conversion of LTA₄-h to LTB₄ and the second step involves the quantification of the LTA₄-h formed with a homogeneous time resolved fluoroescence assay.

Since LTA₄-h hydrolase is grouped with the M1 family of zinc metalloproteases (see, Rudberg, P. C. et al., J. Biol. Chem. 2002, Vol. 277, page 1398-1404), the compounds of the invention can be tested in the standard hydrolase and peptidase assay to determine the compounds' kinetic constants for binding to LTA₄-h hydrolase and for inhibiting LTB₄ synthesis (see Askonas, L. J., et al., The Journal of Pharmacology and Experimental Therapeutics 2002, 300(2): 577-582; Penning, T. D., J. Med. Chem. 2000, 43(4): 721-735; Kull, F. et al., The Journal of Biological Chemistry 1999, 274 (49): 34683-34690, the contents of which are expressly incorporated by reference herein).

Compounds of the invention can also be tested for their ability as inhibitors of LTA₄-h hydrolase in the whole blood assay using human, mouse, rat or dog whole blood (see Penning, T. D. et al., J. Med. Chem. (2000), 43(4): 721-735 for a description of a human whole blood assay and a mouse whole blood assay, the contents of which are expressly incorporated herein).

A hallmark of inflammation is the adhesion and transmigration across endothelium of neutrophils, eosinophils and other inflammatory cells. A similar process is observed for the migration of cells across polarized epithelial cells that occur in the lung, gastrointestinal tract and other organs. Cell culture models of these processes are available and can be used to show the ability of the compounds of the invention to inhibit the transmigration of human neutrophils across human endothelial cells and epithelial cells, including the human intestinal epithelial cell line T₈₄. Accordingly, one of ordinary skill in the art can test the compounds of the invention for their ability to inhibit the transmigration of human neutrophils and eosinophils across human endothelial cells and epithelial cells by performing assays similar to those described in Colgan, S. P., et al., J. Clin. Invest 1993, Vol. 92, No. 1, pp. 75-82, and Serhan, C. N., et al., Biochemistry 1995, Vol. 34, No. 44, pp. 14609-14615.

The air pouch model and/or the mouse zymosan-induced peritonitis model can be used to evaluate the in vivo efficacy of the compounds of the invention in treating an inflammatory response. These are acute experimental models of inflammation characterized by infiltration of inflammatory cells into a localized area. See, for example, the in vivo assays described in Ajuebor, M. N., et al., Immunology 1998, Vol. 95, pp. 625-630; Gronert, K., et al., Am. J. Pathol. 2001, Vol. 158, pp. 3-9; Pouliot, M., et al., Biochemistry 2000, Vol. 39. pp. 4761-4768; Clish, C. B., et al., Proc. Natl. Acad. Sci. U.S.A. 1999, Vol. 96, pp. 8247-8252; Hachicha, M., et al., J. Exp. Med. 1999, Vol. 189, pp. 1923-30.

Animal models (i.e., in vivo assays) can also be utilized to determine the efficacy of the compounds of the invention in treating asthma and related disorders of the pulmonary and respiratory tract, including, but not limited to, asthma. See, for example, the assays described in De Sanctis, G. T. et al., Journal of Clinical Investigation 1999, Vol. 103, pp. 507-515, and Campbell, E. M., et al., J. Immunol. 1998, Vol. 161, No. 12, pp. 7047-7053.

Administration of the compounds of the invention, or their pharmaceutically acceptable salts, in pure form or in an appropriate pharmaceutical composition, can be carried out via any of the accepted modes of administration of agents for serving similar utilities. The pharmaceutical compositions of the invention can be prepared by combining a compound of the invention with an appropriate pharmaceutically acceptable carrier, diluent or excipient, and may be formulated into preparations in solid, semi-solid, liquid or gaseous forms, such as tablets, capsules, powders, granules, ointments, solutions, suppositories, injections, inhalants, gels, microspheres, and aerosols. Typical routes of administering such pharmaceutical compositions include, without limitation, oral, topical, transdermal, inhalation, parenteral, sublingual, rectal, vaginal, and intranasal. The term parenteral as used herein includes subcutaneous injections, intravenous, intramuscular, intrasternal injection or infusion techniques. Pharmaceutical compositions of the invention are formulated so as to allow the active ingredients contained therein to be bioavailable upon administration of the composition to a patient. Compositions that will be administered to a subject or patient take the form of one or more dosage units, where for example, a tablet may be a single dosage unit, and a container of a compound of the invention in aerosol form may hold a plurality of dosage units. Actual methods of preparing such dosage forms are known, or will be apparent, to those skilled in this art; for example, see The Science and Practice of Pharmacy, 20.sup.third Edition (Philadelphia College of Pharmacy and Science, 2000). The composition to be administered will, in any event, contain a therapeutically effective amount of a compound of the invention, or a pharmaceutically acceptable salt thereof, for treatment of a disease or condition of interest in accordance with the teachings of this invention.

A pharmaceutical composition of the invention can be in the form of a solid or liquid. In one aspect, the carrier(s) are particulate, so that the compositions are, for example, in tablet or powder form. The carrier(s) may be liquid, with the compositions being, for example, an oral syrup, injectable liquid or an aerosol, which is useful in, for example, inhalatory administration. When intended for oral administration, the pharmaceutical composition can be in either solid or liquid form, where semi-solid, semi-liquid, suspension and gel forms are included within the forms considered herein as either solid or liquid.

As a solid composition for oral administration, the pharmaceutical composition may be formulated into a powder, granule, compressed tablet, pill, capsule, chewing gum, wafer or the like form. Such a solid composition will typically contain one or more inert diluents or edible carriers. In addition, one or more of the following may be present: binders such as carboxymethylcellulose, ethyl cellulose, microcrystalline cellulose, gum tragacanth or gelatin; excipients such as starch, lactose or dextrins, disintegrating agents such as alginic acid, sodium alginate, Primogel, corn starch and the like; lubricants such as magnesium stearate or Sterotex; glidants such as colloidal silicon dioxide; sweetening agents such as sucrose or saccharin; a flavoring agent such as peppermint, methyl salicylate or orange flavoring; and a coloring agent.

When the pharmaceutical composition is in the form of a capsule, for example a gelatin capsule, it may contain, in addition to materials of the above type, a liquid carrier such as polyethylene glycol or oil.

The pharmaceutical composition can be in the form of a liquid, for example, an elixir, syrup, solution, emulsion or suspension. The liquid can be for oral administration or for delivery by injection, as two examples. When intended for oral administration, a composition can contain, in addition to the present compounds, one or more of a sweetening agent, preservatives, dye/colorant and flavor enhancer. In a composition intended to be administered by injection, one or more of a surfactant, preservative, wetting agent, dispersing agent, suspending agent, buffer, stabilizer and isotonic agent may be included.

The liquid pharmaceutical compositions of the invention, whether solutions, suspensions or other like form, can include one or more of the following adjuvants: sterile diluents such as water for injection, saline solution, preferably physiological saline, Ringer's solution, isotonic sodium chloride, fixed oils such as synthetic mono or diglycerides which may serve as the solvent or suspending medium, polyethylene glycols, glycerin, propylene glycol or other solvents; antibacterial agents such as benzyl alcohol or methyl paraben; antioxidants such as ascorbic acid or sodium bisulfate; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. The parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic. Physiological saline is a preferred adjuvant. An injectable pharmaceutical composition is preferably sterile.

A liquid pharmaceutical composition of the invention intended for either parenteral or oral administration should contain an amount of a compound of the invention such that a suitable dosage will be obtained. Typically, this amount is at least 0.01% of a compound of the invention in the composition. When intended for oral administration, this amount may be varied to be between 0.1 and about 70% of the weight of the composition. Preferred oral pharmaceutical compositions contain between about 4% and about 50% of the compound of the invention. Preferred pharmaceutical compositions and preparations according to the present invention are prepared so that a parenteral dosage unit contains between 0.01 to 10% by weight of the compound prior to dilution of the invention.

The pharmaceutical composition of the invention can be intended for topical administration, in which case the carrier may suitably comprise a solution, emulsion, ointment or gel base. The base, for example, may comprise one or more of the following: petrolatum, lanolin, polyethylene glycols, bee wax, mineral oil, diluents such as water and alcohol, and emulsifiers and stabilizers. Thickening agents may be present in a pharmaceutical composition for topical administration. If intended for transdermal administration, the composition may include a transdermal patch or iontophoresis device. Topical formulations may contain a concentration of the compound of the invention from about 0.1 to about 10% w/v (weight per unit volume).

The pharmaceutical composition of the invention can be intended for rectal administration, in the form, for example, of a suppository, which will melt in the rectum and release the drug. The composition for rectal administration may contain an oleaginous base as a suitable nonirritating excipient. Such bases include, without limitation, lanolin, cocoa butter and polyethylene glycol.

The pharmaceutical composition of the invention can include various materials, which modify the physical form of a solid or liquid dosage unit. For example, the composition can include materials that form a coating shell around the active ingredients. The materials that form the coating shell are typically inert, and may be selected from, for example, sugar, shellac, and other enteric coating agents. Alternatively, the active ingredients can be encased in a gelatin capsule.

The pharmaceutical composition of the invention in solid or liquid form can include an agent that binds to the compound of the invention and thereby assists in the delivery of the compound. Suitable agents that may act in this capacity include a monoclonal or polyclonal antibody, a protein or a liposome.

The pharmaceutical composition of the invention can consist of dosage units that can be administered as an aerosol. The term aerosol is used to denote a variety of systems ranging from those of colloidal nature to systems consisting of pressurized packages. Delivery can be by a liquefied or compressed gas or by a suitable pump system that dispenses the active ingredients. Aerosols of compounds of the invention may be delivered in single phase, bi-phasic, or tri-phasic systems in order to deliver the active ingredient(s). Delivery of the aerosol includes the necessary container, activators, valves, subcontainers, and the like, which together may form a kit. One skilled in the art, without undue experimentation may determine preferred aerosols.

The pharmaceutical compositions of the invention cam be prepared by methodology well known in the pharmaceutical art. For example, a pharmaceutical composition intended to be administered by injection can be prepared by combining a compound of the invention with sterile, distilled water so as to form a solution. A surfactant may be added to facilitate the formation of a homogeneous solution or suspension. Surfactants are compounds that non-covalently interact with the compound of the invention so as to facilitate dissolution or homogeneous suspension of the compound in the aqueous delivery system.

The compounds of the invention, or their pharmaceutically acceptable salts, are administered in a therapeutically effective amount, which will vary depending upon a variety of factors and can be determined routinely by one of ordinary skill in the art. Generally, a therapeutically effective daily dose is (for a 70 kg mammal) from about 0.001 mg/kg (i.e., 0.7 mg) to about 100 mg/kg (i.e., 7.0 gm); preferably a therapeutically effective dose is (for a 70 kg mammal) from about 0.01 mg/kg (i.e., 7 mg) to about 50 mg/kg (i.e., 3.5 gm); more preferably a therapeutically effective dose is (for a 70 kg mammal) from about 1 mg/kg (i.e., 70 mg) to about 25 mg/kg (i.e., 1.75 gm).

Compounds of the invention, or pharmaceutically acceptable derivatives thereof, may also be administered simultaneously with, prior to, or after administration of one or more other therapeutic agents. Such combination therapy includes administration of a single pharmaceutical dosage formulation which contains a compound of the invention and one or more additional active agents, as well as administration of the compound of the invention and each active agent in its own separate pharmaceutical dosage formulation. For example, a compound of the invention and the other active agent can be administered to the patient together in a single oral dosage composition such as a tablet or capsule, or each agent can be administered in separate oral dosage formulations. Where separate dosage formulations are used, the compounds of the invention and one or more additional active agents can be administered at essentially the same time, i.e., concurrently, or at separately staggered times, i.e., sequentially; combination therapy is understood to include all these regimens.

The compounds of the invention are inhibitors of LTA₄ hydrolase activity and are therefore useful in treating diseases and disorders which are ameliorated by the inhibition of LTA4 hydrolase activity. Such diseases and conditions include inflammatory and autoimmune disorders and pulmonary and respiratory tract inflammation.

Accordingly, the compounds are useful in the treatment of the following diseases or disorders in mammals, particularly humans: acute or chronic inflammation, anaphylactic reactions, allergic reactions, allergic contact dermatitis, allergic rhinitis, chemical and non-specific irritant contact dermatitis, urticaria, atopic dermatitis, psoriasis, fistulas associated with Crohn's disease, pouchitis, septic or endotoxic shock, hemorrhagic shock, shock-like syndromes, capillary leak syndromes induced by immunotherapy of cancer, acute respiratory distress syndrome, cystic fibrosis, traumatic shock, immune- and pathogen-induced pneumonias, immune complex-mediated pulmonary injury and chronic obstructive pulmonary disease, inflammatory bowel diseases (including ulcerative colitis, Crohn's disease and post-surgical trauma), gastrointestinal ulcers, diseases associated with ischemia-reperfusion injury (including acute myocardial ischemia and infarction, acute renal failure, ischemic bowel disease and acute hemorrhagic or ischemic stroke), immune-complex-mediated glomerulonephritis, autoimmune diseases (including insulin-dependent diabetes mellitus, multiple sclerosis, rheumatoid arthritis, osteoarthritis and systemic lupus erythematosus), acute and chronic organ transplant rejection, transplant arteriosclerosis and fibrosis, cardiovascular disorders (including hypertension, atherosclerosis, aneurysm, critical leg ischemia, peripheral arterial occlusive disease and Reynaud's syndrome), complications of diabetes (including diabetic nephropathy, neuropathy and retinopathy), ocular disorders (including macular degeneration and glaucoma), neurodegenerative disorders (including delayed neurodegeneration in stroke, Alzheimer's disease, Parkinson's disease, encephalitis and HIV dementia), inflammatory and neuropathic pain including arthritic pain, periodontal disease including gingivitis, ear infections, migraine, benign prostatic hyperplasia, and cancers (including, but not limited to, leukemias and lymphomas, prostate cancer, breast cancer, lung cancer, malignant melanoma, renal carcinoma, head and neck tumors and colorectal cancer).

The compounds are also useful in treating folliculitis induced by inhibitors of epidermal growth factor (EGF) or epidermal growth factor receptor (EGFR) kinase used in the treatment of solid tumors. Clinical trials have revealed folliculitis (inflammation of the hair follicle manifested by severe acne-like skin rash on the face, chest and upper back) as a major dose-limiting side effect of such treatments. Such folliculitis is associated with an infiltration of neutrophils suggesting products secreted by activated neutrophils to be the cause of the inflammation. The compounds of the invention inhibit neutrophil or eosinophil-mediated inflammation, and are therefore useful in treating such folliculitis, thereby improving the quality of life of the treated cancer patients but also allowing for the increase of the dosage of the EGF inhibitor or EGFR kinase inhibitor or the extension of the duration of the treatment, resulting in improved efficacy of the desired inhibitor.

The compounds are also useful in the treatment of pulmonary and respiratory inflammation disorders in mammals, particularly humans, including, but not limited to, asthma, chronic bronchitis, bronchiolitis, bronchiolitis obliterans (including such with organizing pneumonia), allergic inflammation of the respiratory tract (including rhinitis and sinusitis), eosinophilic granuloma, pneumonias, pulmonary fibroses, pulmonary manifestations of connective tissue diseases, acute or chronic lung injury, chronic obstructive pulmonary diseases, adult respiratory distress syndrome, and other non-infectious inflammatory disorders of the lung characterized by eosinophil infiltration.

For example, the compounds of the invention are useful in the inhibition of: eosinophil-mediated inflammation of the lung or tissues; neutrophil-mediated inflammation of the lung; lymphocyte-mediated inflammation of the lung; airway hyper-responsiveness; and airway and vascular inflammation.

The compounds are also useful in the treatment of myocardial infarction or susceptibility to myocardial infarction in mammals, particularly humans, transient ischemic attack, transient monocular blindness, stroke or susceptibility of stroke, claudication, peripheral arterial occlusive disease or susceptibility to peripheral arterial occlusive disease, and acute coronary syndrome (such as unstable angina, non-ST-elevation myocardial infarction or ST-elevation myocardial infarction). The compounds are also useful in the methods for reducing the risk of myocardial infarction, stroke or peripheral arterial occlusive disease in mammals and reducing the risk of a second myocardial infarction or stroke.

The compounds are also useful in the treatment of atherosclerosis in mammals, particularly humans who require treatment (such as angioplasty, stents, coronary artery bypass graft) in order to restore blood flow in the arteries (such as in the coronary arteries).

The compounds described herein can also be used in the treatment of neurodegenerative diseases. Non-limiting examples of neurodegenerative diseases that can be treated according to a method of the invention are amyotrophic lateral sclerosis (ALS), Parkinson's disease and Huntington's disease.

The compounds of the invention can be used in the treatment of cancer. In some embodiments, the cancer is leukemia. Specific exemplary leukemias that can be treated by administering a compound of the invention are Chronic Granulocytic Leukemias, Chronic B-Cell Leukemias and Chronic Myelogenous Leukemias. The invention also encompasses a method of treating a solid tumor in a subject in need thereof. Non-limiting examples of solid tumors that can be treated according to the methods described herein are ovarian, esophageal and hepatocellular tumors.

In certain embodiments, the invention is a method of treating respiratory inflammation in a subject in need thereof comprising administering to said subject a compound of described herein. In one embodiment, the respiratory inflammation is cystic fibrosis.

In yet additional aspects, the invention encompasses a method of treating an inflammatory skin condition. Non-limiting examples of inflammatory skin conditions are atopic dermatitis, acne, psoriasis and eczema.

In some embodiments, the invention is directed to a method of treating a condition selected from the group consisting of cystic fibrosis, idiopathic pulmonary fibrosis, interstitial lung disease associated with systemic sclerosis, atherosclerosis, osteoarthritis, Alzheimer's disease, osteoporosis, and type II diabetes, allergic rhinitis, acne, and gingivitis.

Also encompasses is a method of treating an eosinophilic disorder. Exemplary eosinophilic disorders are eosinophilic esophagitis, eosinophilic gastroenteritis, eosinophilic colitis, eosinophilic fasciitis, eosinophilic pneumonia, eosinophilic cystitis, hypereosinophilic syndrome and Churg Strauss Syndrome. In some embodiments, the eosinophilic disorder is eosinophilic esophagitis.

The compounds are also useful in inhibiting the synthesis of leukotriene B₄ in both in vitro and in vivo assays.

The invention is illustrated by the following non-limiting examples.

EXEMPLIFICATION Example 1: Preparation of Compound 22

Preparation of 4-(4-chlorophenoxy)benzaldehyde

To a solution of 4-chlorophenol in DMF, potassium carbonate was added. The reaction was stirred at ambient temperature as 4-fluorobenzaldehyde was added. The reaction was heated at 150° C. until all starting material was consumed. The reaction was allowed to cool and treated with aqueous sodium bicarbonate solution. The reaction mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate and concentrated. Chromatography gave the desired aldehyde.

Preparation of 5-cyano-2-(3-ethoxycarboxypiperidinyl)-pyridine

To a solution of 2-chloro-5-cyanopyridine in acetonitrile was added ethyl piperidine-3-carboxylate. The reaction was stirred until reagents were consumed.

Preparation of 5-(aminomethyl)-2-(3-ethoxycarboxypiperidinyl)-pyridine

Into a solution of 5-cyano-2-(3-ethoxycarboxypiperidinyl)-pyridine in ethanol containing ammonium hydroxide was bubbled nitrogen to remove oxygen and treated with Raney Nickel. The reaction mixture was placed on a Parr hydrogenator, the atmosphere was changed to hydrogen using a vacuum system and mixture shaken. After a reduction in gas pressure and starting material was consumed, the reaction was filtered. The filtrate was washed with ethanol and the combined washes concentrated to give the desired product.

Preparation of Substituted Piperidine Ester

A solution of 5-(aminomethyl)-2-(3-ethoxycarboxypiperidinyl)-pyridine and 4-(4-chlorophenoxy)benzaldehyde in dichloromethane was stirred and treated with sodium triacetoxyborohydride. The reaction was complete by TLC analysis. The reaction mixture was treated with a saturated sodium bicarbonate solution. The mixture was extracted with dichloromethane. The combined organic extracts were washed with water, dried over sodium sulfate and concentrated under reduced pressure. Chromatography gave the desired product.

Preparation of Subsituted Pyridine

A solution of ethyl ester in a mixture of methanol and aqueous lithium hydroxide was stirred until no starting material was observed by TLC. The reaction was concentrated. The residue was suspended in ether and treated with aqueous hydrochloric acid. The resulting solid was isolated by filtration and dried to give the desired product.

Example 2: Biological Activity

Tables 4 to 6 below show the IC₅₀ values for peptidase, hydrolase and whole blood assay (WBA) activity for exemplary compounds encompassed by the invention. The whole blood and aminopeptidase assays were performed as described in Penning et al., J. Med. Chem. 2000, 43, 721-735, and Rudberg et al., J. Biol. Chem. Vol. 279, No. 26, Issue of June 25, pp. 27376-27382, 2004, the contents of each of which are expressly incorporated by reference herein. The hydrolase assay was performed as described in U.S. Pat. No. 7,737,145, the contents of which are expressly incorporated herein.

TABLE 4

IC₅₀ IC₅₀ Com- Peptidase Hydrolase IC₅₀ WBA pound (nM or % (nM or % (nM or % No. X Y inhibition) inhibition) inhibition)  1

490 (N2)  280 (N2)  210 (N2)  2

 68 (N2)  69 (N2)  730 (N3)  r360 (N2)  3

 21 (N2)  100 (N2)  800 (N2)  r420 (N2)  4

300 (N2) 47% inhibition at 1 uM (N2) 2100 (N2)  5

 45 (N2)  43 (N2)  570 (N2)  6

18% inhibition 1 uM (N2)  7

11% inhibition 1 uM (N2)  8

 78 (N2)  50 (N2)  290 (N2)  9

45% inhibition at 1 uM (N2) 10

 39 (N2)  23 (N2) 1900 (N2) 11

17% inhibition at 1 uM (N2) 12

 12 (N2)  33 (N2)  360 (N2) 13

 75 (N2) 1400 (N2) 2300 (N2) 14

 61 (N2)  350 (N2) 1500 (N4) 15

470 (N2) 18% inhibition 3 um (N2) 1950 (N5) 16

 81   3  880 (N2) 17

 54   5 (n = 2) 18

 16 (n = 2)  68 (n = 2) 19

 45 (n = 2) 20

 10 (n = 2) 21

 2 (n = 2)

TABLE 5

Compound IC₅₀ Peptidase IC₅₀ Hydrolase IC₅₀ WBA No. X Y (nM or % inhibition) (nM or % inhibition) (nM or % inhibition) 22

H  3.9 (N2)  4.8 (N2)  32 (N3) 23

CH₂CH₂—OMe 85  700   (n2)  470 (N2) 24

Me 28  (n2) 150   (N2) 25

H 13  (n2)  3   (N = 4)  55 (N4) 26

Me 33  (n2) 85   180 (N2) 27

Me 48  (n2) 320   (N3)  510 (N4) 28

H 73  (n2) 260   (n = 2) 1000 (N2) 29

H  4  (n2)  160 (N2) 30 2HC1 salt

H  5  (n2)  1  (n = 3)  120 (N2) 31

H 42  (n2)  9  (n = 2)  230 (N2) 32

H 10  37  (n = 2) 33

H  8  (n = 2)  8  (n = 2) 34

H 13  (n = 2) 86  (n = 2) 35

H 45  (n = 2) 110   (n = 2) 36

H  7  (n = 2) 19  (n = 2) 37 S-isomer

H 12  (n = 2) 38 R-isomer

H 16  (n = 2) 39

H 170   (n = 2) 40

H 21  (n = 2)

TABLE 6

Compound IC₅₀ Peptidase IC₅₀ Hydrolase IC₅₀ WBA No. X Y (nM or % inhibition) (nM or % inhibition) (nM or % inhibition) 41 H

 0% inhibition at 1 uM 42 H

850 (N2) 0% inhibition at 3 uM (N2) >3000 (N3) 43 H

 0% inhibition at 3 uM (N2) 44 H

39% inhibition at 3 uM (N2)

While this invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims. 

1-35. (canceled)
 36. A method of treating a disease or disorder ameliorated by the inhibition of leukotriene A₄ hydrolase activity in a mammal, wherein the method comprises administering to a mammal in need thereof an effective amount of a compound of Formula (I):

wherein: R is i) the group;

or ii) the group;

or iii) an optionally substituted heteroaryl; n₁, n₂, and n₃ are each independently 0 to 2; r is 0 to 4; R^(1a), R^(1b), R^(1c), R^(1d) and R^(1e) are each independently hydrogen, OR¹⁰, C(O)OR¹⁰, C(O)R¹⁰, optionally substituted C₁-C¹² alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, or optionally substituted heterocyclyl; R^(1v), R^(1w), R^(1x), R^(1y) and R^(1z) are each independently hydrogen or fluoro; R³ is a direct bond, —O—, —R¹²—O—, —O—R¹²—, —O—R¹²—O—, an optionally substituted straight or branched C₁ to C12 alkylene chain, an optionally substituted straight or branched C₂ to C₁₂ alkenylene chain, or an optionally substituted straight or branched C₂ to C₁₂ alkynylene chain; R⁴ is a direct bond, —O—R^(12a), an optionally substituted straight or branched C₁ to C₁₂ alkylene chain, an optionally substituted straight or branched C₂ to C₁₂ alkenylene chain, or an optionally substituted straight or branched C₂ to C₁₂ alkynylene chain; each R^(5a) and R^(6a) are each independently hydrogen and optionally substituted alkyl; or R^(5a) and R^(6a) together can be an oxo group; R⁷ is hydrogen, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—N(R¹⁰)R¹¹, N(R¹⁰)C(O)N(R¹⁰)R¹¹, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, optionally substituted aryl, optionally substituted heteroaryl, and optionally substituted heterocyclyl; each R⁹ is independently —OR¹⁰, optionally substituted C₁-C12 alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, halo, optionally substituted aryl, or optionally substituted heteroaryl; each R¹⁰ and R¹¹ is independently hydrogen, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, optionally substituted aryl, optionally substituted heteroaryl, and optionally substituted heterocyclyl; or R¹⁰ and R¹¹, together with the nitrogen to which they are attached, form an optionally substituted N-heterocyclyl or an optionally substituted N-heteroaryl; R¹² is an optionally substituted straight or branched C₁ to C₁₂ alkylene chain, an optionally substituted straight or branched C₂ to C₁₂ alkenylene chain, or an optionally substituted straight or branched C₂ to C₁₂ alkynylene chain; R^(12a) is an optionally substituted straight or branched C₁ to C₁₂ alkylene chain, an optionally substituted straight or branched C₂ to C₁₂ alkenylene chain, or an optionally substituted straight or branched C₂ to C₁₂ alkynylene chain; each R¹³ is independently a direct bond, an optionally substituted straight or branched C₁ to C12 alkylene chain, an optionally substituted straight or branched C₂ to C₁₂ alkenylene chain, or an optionally substituted straight or branched C₃ to C₁₂ alkynylene chain; and R¹⁵ is an optionally substituted phenyl or an optionally substituted pyridyl; as a single stereoisomer or as a mixture of stereoisomers; or a pharmaceutically acceptable salt thereof.
 37. The method of claim 36, wherein the mammal is a human.
 38. The method of claim 37, wherein the disease or disorder is an inflammatory or autoimmune disorder.
 39. The method of claim 37, wherein the disease or disorder is a pulmonary or respiratory tract inflammation.
 40. The method of claim 37, wherein the disease or disorder is selected from the group consisting of acute or chronic inflammation, anaphylactic reactions, allergic reactions, allergic contact dermatitis, allergic rhinitis, chemical and non-specific irritant contact dermatitis, urticaria, atopic dermatitis, psoriasis, cystic fibrosis, fistulas associated with Crohn's disease, pouchitis, septic or endotoxic shock, hemorrhagic shock, shock-like syndromes, capillary leak syndromes induced by immunotherapy of cancer, acute respiratory distress syndrome, traumatic shock, immune- and pathogen-induced pneumonias, immune complex-mediated pulmonary injury and chronic obstructive pulmonary disease, inflammatory bowel diseases, gastrointestinal ulcers, diseases associated with ischemia-reperfusion injury, immune-complex-mediated glomerulonephritis, autoimmune diseases acute and chronic organ transplant rejection, transplant arteriosclerosis and fibrosis, cardiovascular disorders, complications of diabetes, ocular disorders, neurodegenerative disorders, inflammatory and neuropathic pain including arthritic pain, periodontal disease including gingivitis, ear infections, migraine, benign prostatic hyperplasia, and cancers.
 41. (canceled)
 42. (canceled)
 43. The method of claim 39, wherein the pulmonary and respiratory inflammation disorders is selected from the group consisting of asthma, chronic bronchitis, bronchiolitis, bronchiolitis obliterans, allergic inflammation of the respiratory tract, eosinophilic granuloma, pneumonias, pulmonary fibroses, pulmonary manifestations of connective tissue diseases, acute or chronic lung injury, chronic obstructive pulmonary diseases, adult respiratory distress syndrome, and other non-infectious inflammatory disorders of the lung characterized by eosinophil infiltration.
 44. The method of claim 40, wherein the disease or disorder is cystic fibrosis. 45-50. (canceled)
 51. The method of claim 36, wherein the disease or disorder is an inflammatory skin condition.
 52. The method of claim 51, wherein the inflammatory skin condition is selected from the group consisting of atopic dermatitis, acne, psoriasis and eczema.
 53. The method of claim 36, wherein R¹⁵ is an optionally substituted pyridyl.
 54. The method of claim 36, wherein R¹⁵ is an optionally substituted phenyl.
 55. The method of claim 53, wherein R¹⁵ has the following structure:

wherein each R¹⁶ is independently selected from the group consisting of hydrogen, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C12 alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl, OR¹⁰, NO₂, S(O)_(j)R₁₀, S(O)_(j)NR¹⁰R¹¹, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—N(R¹⁰)R¹¹, N(R¹⁰)C(O)N(R¹⁰)R¹¹, N(R¹⁰)R¹¹, and N(R₁₀)C(O)R₁₀; wherein w is an integer from 1 to 4; and wherein j is 0, 1 or
 2. 56. The method of claim 55, wherein R¹⁵ has the structure:


57. The method of claim 56, wherein R¹⁶ is selected from the group consisting of an optionally substituted heterocyclyl containing one or more ring nitrogen atoms, an optionally substituted heteroaryl containing one or more nitrogen atoms, NR₁₀R₁₁ and OR₁₀.
 58. The method of claim 56, wherein R¹⁶ is OR¹⁰, and wherein R¹⁰ is selected from the group consisting of optionally substituted phenyl.
 59. The method of claim 56, wherein R¹⁶ is an N-heterocyclyl.
 60. The method of claim 59, wherein R¹⁶ is the group:

wherein each R¹⁸ is independently selected from the group consisting of hydrogen, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl, OR¹⁰, NO₂, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—N(R¹⁰)R¹¹, N(R¹⁰)C(O)N(R¹⁰)R¹¹, NR₁₀R₁₁, and N(R₁₀)C(O)R₁₀; and and z is an integer from 0 to
 5. 61. The method of claim 60, wherein R¹⁶ has the structure:


62. The method of claim 54, wherein R¹⁴ is phenyl optionally substituted with one or more R¹⁷, wherein R₁₇ is selected from the group consisting of hydrogen, optionally substituted C₁-C12 alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl, OR¹⁰, NO₂, S(O)_(j)R₁₀, S(O)_(j)NR¹⁰R¹¹, C(O)R¹⁰, C(O)OR¹⁰, C(O)—R¹³—NR¹⁰R¹¹, NR¹⁰C(O)NR¹⁰R¹¹, NR¹⁰R¹¹, and NR₁₀C(O)R₁₀.
 63. The method of claim 62, wherein R¹⁷ is selected from the group consisting of an optionally substituted heterocyclic containing one or more ring nitrogen atoms, an optionally substituted heteroaryl containing one or more nitrogen atoms, NR¹⁰R¹¹ and OR₁₀.
 64. The method of claim 63, wherein R¹⁷ is OR¹⁰ and wherein R¹⁰ is an optionally substituted phenyl.
 65. The method of claim 63, wherein R¹⁷ is an optionally substituted N-heterocyclyl.
 66. The method of claim 36, wherein each R^(5a) and R^(6a) are each independently hydrogen, alkyl, haloalkyl or hydroxyalkyl.
 67. The method of claim 36, wherein R is the group:


68. The method of claim 67, wherein R^(1a) is hydrogen, C(O)OR¹⁰, C(O)R¹⁰, C(O)NR¹⁰R¹¹, optionally substituted C₁-C₁₂ alkyl, optionally substituted C₂-C₁₂ alkenyl, optionally substituted C₂-C₁₂ alkynyl, optionally substituted C₃-C₁₅ cycloalkyl, optionally substituted C₃-C₁₅ cycloalkenyl, halo, cyano, optionally substituted aryl, optionally substituted heteroaryl, and optionally substituted heterocyclyl.
 69. The method of claim 68, wherein R^(1a) is hydrogen, C(O)OR¹⁰, C(O)R¹⁰, C(O)NR¹⁰R¹¹, optionally substituted alkyl, halo, optionally substituted phenyl, furanyl, thienyl, thiazolyl, or optionally substituted oxazolyl; and wherein R^(1b), R^(1c), R^(1d) and R^(1e) are each hydrogen.
 70. The method of claim 36, wherein R is an optionally substituted heteroaryl.
 71. The method of claim 70, wherein R is furanyl, oxazolyl, pyrazolyl, pyridinyl, triazolyl, thiazolyl, or benzothiazolyl, each of which is optionally substituted.
 72. The method of claim 36, wherein R³ is O.
 73. The method of claim 36, wherein R⁴ is a direct bond, an optionally substituted methylene or an optionally substituted ethylene.
 74. The method of claim 73, wherein R⁴ is methylene.
 75. The method of claim 73, wherein R⁴ is a direct bond.
 76. The method of claim 73, wherein R¹⁵ is optionally substituted phenyl.
 77. The method of claim 36, wherein R⁷ is hydrogen or optionally substituted C₁-C₆ alkyl.
 78. The method of claim 36 selected from the compounds in the Tables below:

X = Y =

X Y H

H

H

H

X Y

H

CH₂CH₂—OMe

Me

H

Me

Me

H

H

H

H

H

H

H

H

H

H

H

H

H 